Dental unit



FIG. 1 is a front elevation of the dental unit, embodying my new design;

FIG. 2 is a rear elevation thereof;

FIG. 3 is a side elevation of the unit, viewed from the right in relation to FIG. 1;

FIG. 4 is a side elevation, viewed from the left;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a perspective view thereof. 

The ornamental design for a dental unit, as shown and described. 